#include<iostream>
#include<iomanip>
using namespace std;
int main(){
float a, sum;
sum=0;
float min = 1000000;
float max = 0;
for (int i=1;i<=10;i++){
cin>>a;
sum+=a;
if (a>max){
max = a;
}
if (a<min){
min = a;
}
}
float p=(sum-max-min)/8;
cout<<fixed<<setprecision(2)<<p;
return 0;
}